package sc;

import java.io.IOException;
import java.net.URL;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.FloatControl;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import javax.sound.sampled.UnsupportedAudioFileException;

public class PlayWav extends Thread
{
	private SourceDataLine auline = null;
	private URL url;
	private Position curPosition;

	private final int EXTERNAL_BUFFER_SIZE = 524288; // 128Kb

	enum Position
	{
		LEFT, RIGHT, NORMAL
	};

	public PlayWav(String wavfile)
	{
		url = this.getClass().getResource(wavfile);
		curPosition = Position.NORMAL;
	}

	public PlayWav(String wavfile, Position p)
	{
		url = this.getClass().getResource(wavfile);
		curPosition = p;
	}
	
	public void end()
	{
		auline.close();
	}

	public void run()
	{
		AudioInputStream audioInputStream = null;
		try
		{
			audioInputStream = AudioSystem.getAudioInputStream(url);
		}
		catch (UnsupportedAudioFileException e1)
		{
			e1.printStackTrace();
			return;
		}
		catch (IOException e1)
		{
			e1.printStackTrace();
			return;
		}

		AudioFormat format = audioInputStream.getFormat();
		
		DataLine.Info info = new DataLine.Info(SourceDataLine.class, format);

		try
		{
			auline = (SourceDataLine) AudioSystem.getLine(info);
			auline.open(format);
		}
		catch (LineUnavailableException e)
		{
			e.printStackTrace();
			return;
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return;
		}

		if (auline.isControlSupported(FloatControl.Type.PAN))
		{
			FloatControl pan = (FloatControl) auline
					.getControl(FloatControl.Type.PAN);
			if (curPosition == Position.RIGHT)
				pan.setValue(1.0f);
			else if (curPosition == Position.LEFT)
				pan.setValue(-1.0f);
		}

		auline.start();
		int nBytesRead = 0;
		byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];

		try
		{
			while (nBytesRead != -1)
			{
				nBytesRead = audioInputStream.read(abData, 0, abData.length);
				if (nBytesRead >= 0)
					auline.write(abData, 0, nBytesRead);
			}
		}
		catch (IOException e)
		{
			e.printStackTrace();
			return;
		}
		finally
		{
			auline.drain();
			auline.close();
		}

	}
}
